SW5240102_Response To Comments_20240813

Gettle Engineering and Design, PLLC
3616 Waxwing Ct.
Wake Forest, NC 27587
NC License P-2538 919.210.3934
August 5, 2024
Brianna Holland
Environmental Engineer
North Carolina Department of Environmental Quality
512 N. Salisbury Street, Office 640E
Raleigh, NC 27604
Subject: Project Name: Jeffery Way Commercial
Stormwater Permit No. SW5240102
County: Franklin
City: Youngsville
As noted in the attached Request for Additional Information Letter, dated July 19, 2024, the
following responses to comments are noted below.
1. Plans
a. The drainage area delineated on the plans does not include the SCM. Please ensure
the drainage area includes all areas draining to the SCM, including the area of the
SCM.
Response: The drainage area noted has been revised.
2. Supplement-EZ
lx hard copy of the complete, original Supplement-EZ Form is required per Sections V& VI, 3
of the Application
Response: 1 hard copy provided in resubmittal.
a. Cover
i. Line 7-8: Please fill in. Per 15A NCAC 02H .1017 (10),the vegetated setback shall
be at least 30 feet in width.
Response: Revised as noted.
b. Drainage Area Page
i. The entire site column is an accounting of the entire project area. BUA that is
located within the project area should be included within the entire site column,
whether or not it drains to the SCM.
Response: Revised as noted.
The drainage area columns (to the right of the entire site column) are an
accounting of all of the areas draining to the SCM).
Response: Revised as noted.
c. Bioretention Cell Page
i. Line 18: The provided SHWT report indicates a SHWT elevation of 419.0', please
Gettle Engineering and Design,PLLC, 3616 Waxwing Ct.,Wake Forest,NC 27587, [phone], NC License P-2538 Page 1 of 2

revise,
Response: SHWT revised per updated report provided by soil scientist, dated July 25, 2024.
ii. Line 19: Per previous comment, please ensure SHWT separation is achieved per
Bioretention MDC 1.
Response: Per SHWT updated report the separation is achieved.
3. Calculations:
a. 15A NCAC 02H .1002 (50) "Ten-year storm intensity" means the maximum rate of
rainfall of a duration equivalent to the time of concentration expected, on the average,
once in 10 years. Ten-year storm intensities are estimated by the National Oceanic
and Atmospheric Administration (NOAA) Precipitation Frequency Data
Server(PFDS), which is herein incorporated by reference, including subsequent
amendments and editions, and may be accessed at no cost at
http://hdsc.nws.noaa.gov/hdsc/pfds/. Please revise calculations as it appears the 10-
year 24 hour storm was used.
Response: Calculations intensity revised.
4. Show each of the above comments has been addressed. This item is required per 15A
NCAC 02H .1042(3)(b).
Response: Response letter provided.
5. Provide PDFs of all revisions, 2 hardcopies of revised plan sheets, 1 hardcopy of other
documents, and a response to comments letter briefly describing how the comments have
been addressed.
Response: Revised PDF of sheet D5 provided.
Please advise if further information is required.
Sincerely,
Keith P Gettle,
NC 30913
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Gettle Engineering and Design,PLLC, 3616 Waxwing Ct.,Wake Forest,NC 27587, [phone], NC License P-2538 Page 2 of 2